Exact length of stationmaster Mk1?
Jason Reilly
I purchased a second hand stationmaster Mk1 the other day, and found that it
had been modified from the original design (slots cut in the tubing and hose
clamps to make the joins instead of screws). I found that as it was, it was
resonating best at about 28.5 MHz (tuning the coil didn't help much) and had
to lengthen it some 55cm and move the tap on the tuning coil up one turn to
get good SWR on 27.200 MHz.
Can anyone tell me what the exact length of the station master antenna is
from tip to bottom bracket where the SO239 connector is?
Ta - Jason.
JT
17.205FT
"Jason Reilly" <jasonrei...@primus.com.au> wrote in message
news:3dccb...@news.iprimus.com.au...
Marty
hose
> clamps to make the joins instead of screws). I found that as it was, it
was
Strange - my MkI was the same (slots & hose clamps) from the day I got it,
no screws....
Sorry can't help with the length - mine has now been modified for 6M band so
it is definately too short for 11M!!
--
Martin, VK2UMJ
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Ghost Ball
well the ones i have seen were
hope this helps :)
"Jason Reilly" <jasonrei...@primus.com.au> wrote in message
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Marty
installation by adding 55cm and moving the tap up one turn, then all is
fine! What the total length of other Station Master antenna are is rather
irrelevant if you've been able to tune yours to a suitable reading.
--
Martin, VK2UMJ
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"Jason Reilly" <jasonrei...@primus.com.au> wrote in message
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Jason Reilly
might not be radiating all the RF power - or not radiating it where it
should go. A dummy load will have a good SWR, but it ain't much good for
talking DX!
I've got my concerns that with lengthening the main radiator so much that
I've turned it into a 5/8th by accident, or there is something horribly out
of whack - the main element is a full metre longer than I calculate for
being a half wave. At 20% longer than what it should be, that is a worry.
I must admit, I was tuning the antenna mounted only 1 metre above ground
level (which is where it will be used) and there is a building and tree both
within 10 metres of the location.
I'll have to test the antenna with a station some distance away and compare
it with a nearby station using a similar antenna.
Ta - Jason
"Marty" <vk2...@NOSPAM.yahoo.com.au> wrote in message
news:2Fmz9.73645$g9.2...@newsfeeds.bigpond.com...
Tony Lock
I also have a station master, although I have been told mine is a base
master (Tandy copy). I believe the Station Masters have the oragange PVC
whereas mine has a grey PVC. Anyway, if you dont have an answer yet, let me
know & i will measure it. It had it out the other day testing my new 6 M
portable mast for the MRC, needed a few ropes, but should work pretty good.
Let me know
Tony
www.mrc.cat.net.au
MRC Nov 30 2002
"Jason Reilly" <jasonrei...@primus.com.au> wrote in message
news:3dd00...@news.iprimus.com.au...
Marty
> My concern is that while I might have a fantastic return loss (55dB!) it
> might not be radiating all the RF power - or not radiating it where it
> should go. A dummy load will have a good SWR, but it ain't much good for
> talking DX!
Well, the only way you will confirm that ANY antenna is radiating the
maximum power is by using a field strength meter and tuning the antenna for
maximum signal, hopefully this will occur at a point of low SWR!!!
> I've got my concerns that with lengthening the main radiator so much that
> I've turned it into a 5/8th by accident, or there is something horribly
out
> of whack - the main element is a full metre longer than I calculate for
> being a half wave. At 20% longer than what it should be, that is a worry.
> I must admit, I was tuning the antenna mounted only 1 metre above ground
> level (which is where it will be used) and there is a building and tree
both
> within 10 metres of the location.
Yes, this is a concern. Rough calculations have 1/2 wave at 5.2m, and 5/8 at
6.6m (these are only approximate), remembering that the actual antenna
length may be slightly shorter due to velocity factor of material used. My
only suggestion if no-one can provide the exact dimensions to to go back to
a radiator of around 5.5m, set the coil to around mid to lower mid position,
then adjust the length of the radiator down until you get a low SWR, then
fine tune with the coil if necessary.
Experiment!! See how things go.
--
Martin, VK2UMJ
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This is a 18ft STATION MASTER MK1 Antenna that is Brand New in the Box. Its Frequency Range is 26-29mhz and it can be Tuned to most Amateur Bands with a good Tuner. The MK1 is Currently Pre Tuned for 27mhz, Via an Antenna ANALYZER.
Its Power Rating is 1KiloWatt, it can also be Adjusted in length. The MK1 is the Best Performing 1/2 wave vertical ever made, with its Heavy Duty 1KW Pre Tuned External Coil. The Coil has been mounted in Original Design, that can be Easily removed and Serviced or replacement with other Amateur Loading Coils. Example: 80m/40m/20m/ Etc.
The MK1 can also be shortened for 10m and 6m.Truly a Diversified and Modifiable Base Station Vertical, that can also be tuned to the Marine Band 28.880mhz AM.
Some of the benefits of this antenna over others of the same type.
The condition is second to none and all materials are bought from Australian company's, the antenna is constructed so it's not top heavy which means it can handle greater wind speeds,
the antenna is also adjustable from the top of the antenna for fine tuning as well as the coil which is made of 2 mm copper. The adaptor on the bottom that holds the whole thing together is also bigger than other brands, this is very important because this is were it could break or fail.
This antenna does not use hose clamps but instead uses stainless steel screws and galvanized clamps so no rust in one months time. The clamps I supply have a backing, this does two things. One it stops aluminum from bending when tightening around the pole and two you can tighten or mount the antenna securely with out damaging the antenna.
It comes complete with Mounting Brackets, 4 Elements, with Base and end fed SO-239 Connection.
3 year warranty standard on parts and fabrication.
